- There are a lot more manual steps in Homebrew on Linux (Linuxbrew)
  land than there are in Homebrew (core), it feels like.
- This is a first attempt at a maintainer's guide. I have basically
  tried to brain-dump everything that Michka and Shaun have taught me
  over the months into something consumable for future Homebrew on Linux
  maintainers!
- Some of it is overly verbose - the merging docs are taken from
  [Linuxbrew/homebrew-developer's docs](https://github.com/Linuxbrew/homebrew-developer/blob/master/docs/merge-homebrew-core.md)
  which were recently updated to reflect reality but probably don't need
  to have so many words: just some instructions. :-)

Add `GitHub::check_runs`.

Add missing `require`.

Skip AppleScript actions if Automation Access isn't granted.

Improve readability of `brew upgrade`

Revert "argv: move options_only to cli/args"

Revert "argv: move flags_only to cli/args"

build: bump parser from 2.6.4.0 to 2.6.4.1 in /Library/Homebrew

Bumps [parser](https://github.com/whitequark/parser) from 2.6.4.0 to 2.6.4.1.
- [Release notes](https://github.com/whitequark/parser/releases)
- [Changelog](https://github.com/whitequark/parser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/whitequark/parser/compare/v2.6.4.0...v2.6.4.1

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

prof: use ruby-prof 0.18.0

This is the newest version that works with Ruby 2.3.

Also, update the `.gitignore` to hide it while we're here.

argv: move flags_only to cli/args

argv: move options_only to cli/args

Added a flurry of improvements to the brew fish completions

build: bump html-proofer from 3.12.0 to 3.12.2 in /docs

build: bump rubyzip from 1.2.3 to 1.2.4 in /docs

Bumps [html-proofer](https://github.com/gjtorikian/html-proofer) from 3.12.0 to 3.12.2.
- [Release notes](https://github.com/gjtorikian/html-proofer/releases)
- [Commits](https://github.com/gjtorikian/html-proofer/compare/v3.12.0...v3.12.2

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [rubyzip](https://github.com/rubyzip/rubyzip) from 1.2.3 to 1.2.4.
- [Release notes](https://github.com/rubyzip/rubyzip/releases)
- [Changelog](https://github.com/rubyzip/rubyzip/blob/master/Changelog.md)
- [Commits](https://github.com/rubyzip/rubyzip/compare/v1.2.3...v1.2.4

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

New-Maintainer-Checklist: invite to monthly call

Audit bitbucket.com repositories

Audit gitlab.com repositories

workflows/apidoc: amalgamate steps to preserve current directory

pull: fix Homebrew Testing pull regression.